AnswersThatWork
List of Common TCP/IP Port Numbers
List of Common TCP/IP port numbers
For those of you who configure firewalls, routers, port forwarding, and applications
connectivity, this regularly updated document lists all standard, common, well known,
de-facto, as well as application specific TCP/IP PC port numbers used around the world.
The port numbers specifically highlighted in yellow in the port list below, indicate International
Standards ports, some de-facto standard ports, or simply very well-known ports.
Port
Port 21
Type
International Standard
Application
FTP port
This is the port used for all FTP based file
transfers, such as with programs like FTP
Voyager, WS_FTP , Cute FTP , FTP NOW, and
many more. (FTP = File Transfer Protocol).
Port 22
International Standard
SSH Server Listening port
Port used by Secure Shell servers, SSH, to listen
for incoming connections.
Port 23
International Standard
Telnet port
The port used by all T elnet applications.
Port 25
International Standard
SMTP mail port
Standard port used for SMTP mail delivery. This
is the outgoing mail port used by email programs
such as Outlook Express, Outlook, FoxMail, and
hundreds more, and it is also the SMTP
Outgoing port used by mail servers such as
Axigen Mail Server, CMailServer, Lotus Notes,
MailEnable, Merak Mail Server, Microsoft
Exchange, Novell GroupWise, Qmail, PostCast
Server, PostFix, SendMail, SurgeMail, TFS
Secure Message Server, WinMail, or any other
SMTP / ESMTP standards compliant e-mail
MTA (Message Transfer Agent).
Port 42
Microsoft
WINS Replication port
Port used to replicate NETBIOS name tables
from one Windows server to another (see port
137 also)
Port 43
International Standard
WHOIS port
Port used for “WhoIs” requests (for the retrieval
of domain name information) to whois servers.
Port 53
International Standard
DNS port for DNS requests & replies
This port is used by clients and servers when
exchanging Domain Name information and
routing. (DNS = Domain Name Server).
Page 1 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 67
List of Common TCP/IP Port Numbers
Type
International Standard
Application
DHCP port for DHCP requests &
replies
This is the port used by the DHCP server and
clients when the clients checks with the DHCP
server for a new lease and the allocation of an IP
address. (DHCP = Dynamic Host Configuration
Protocol).
Port 79
International Standard
Finger command for SMTP
Mailservers – ETRN Finger port
Port used by SMTP mail servers to send ETRN
Finger commands to message queues servers so
that those message queues servers know that the
mail servers are online and ready to accept
queued up mail. In short : this is the port which
your email server will use to send an ETRN
command to your web hosting company’s mail
servers so that they deliver to you any waiting
incoming mail.
Port 80
International Standard
HTTP port – Internet traffic
The port through which most Internet traffic goes
through, through HTTP requests. This is the
port which web browsers use to browse the web.
Port 102
International Standard
X.400 port
X.400 is one of the earliest standards for
communications between Message Handling
Systems (MHS) in pre-Internet days. As a result
X.400 includes provisions for the network
communications to include information about the
intended destination medium for the message
(e.g : email, fax, telex, etc...).
In the Windows world this port is used by default
by Microsoft Exchange Server MTAs (Message
Transfer Agent) to communicate with each other
on internal networks with multiple Exchange
servers.
Port 110
International Standard
POP3 port
Standard port used for POP3 mail delivery and
collection. This is the port normally called the
Incoming Mail port in email programs such as
Outlook Express, Microsoft Outlook, FoxMail, and
others.
Page 2 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 115
List of Common TCP/IP Port Numbers
Type
International Standard
Application
SFTP port (Secure File Transfer
Protocol)
Port used for FTP file transfers and modifications
over a Secure Shell connection (SSH). This is
sometimes mistakenly called “FTP over SSH”
which it is not – it is actually a completely new file
transfer protocol which includes additional
features such as error detection, resumption of
interrupted transfers, remote file removal, and
enumeration (listing) of remote folders and files.
Additionally, as the protocol operates within the
SSH protocol which secures the connection
through authentication and encryption, this
protocol has the additional advantage of operating
within a secure environment, something which
basic FTP lacks totally (passwords and files are
sent as clear text which can easily be intercepted
and deciphered by snooping programs).
Port 119
International Standard
Newsgroups port
Port used for newsgroups access.
Port 123
International Standard
Network Time Protocol port (NTP)
Port used for checking and synchronising time
with another computer (Time Server).
For
example, this is the port which Windows XP and
Windows Vista use when you configure the clock
to automatically synchronize itself with a time
server on the Internet. Ditto when you configure
a Windows Server to synchronize its time over
the Internet.
Port 135
Microsoft
RPC Locator Service port
The RPC locator Service (Remote Procedure
Call) maintains a list of networked services that
support RPC and DCOM standards. This list
holds information regarding which ports and IP
addresses the services are currently running on
or listening on.
Thanks to this list, other
computers can query this service to find the
details needed to connect to a desired RPC
service.
Port 137
Microsoft
NetBIOS Name service port / WINS
Port used by the NetBIOS protocol to find other
computers on a workgroup network. On a Peer
to Peer network this will be done via broadcast.
If a Windows 2000 server or newer is in place,
the discovery of other computers can be done
with a centralised database called a WINS server
(Windows Internet Naming Service) thereby
reducing latency and bandwidth usage on the
network.
This is analogous to DNS for Internet domain
names and Microsoft 2000 / 2003 Domains.
Page 3 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 143
List of Common TCP/IP Port Numbers
Type
International Standard
Application
Internet Message Access Protocol 4
(IMAP4 port)
This port is used by IMAP4 servers.
IMAP is a method of accessing emails stored
remotely on a mail server (a mailbox). This could
be a mailbox at an ISP or a corporate mail server.
IMAP4 is “the other” message access protocol
– the first one, and most known, being POP3.
IMAP works differently from POP3 :
the
connection to the remote mailbox is constant
compared
to
the
Connect-GetMessagesCloseConnection method of POP3. IMAP allows
more than one email client to be connected to the
same mailbox at the same time – as a direct
result it is the protocol of choice for hand-held
devices like BlackBerrys as you can have your
laptop, desktop PC, and BlackBerry all connected
to your mailbox at the same time, something
which is not possible with POP3 which requires
exclusive access. Another major plus point of
IMAP is the ability to retrieve parts of the email,
such as the subject only, the message body only,
or the attachments only – this is another reason
for it being the protocol of choice for devices like
BlackBerrys where the user can have the device
configured to download and show only the
message subjects and when the user decides to
open the email in full, then at that point the device
requests, specifically, the only the body of the
message. Last but not least, the IMAP protocol
includes the provision of message status flags
which let the remote client know whether a
message has been read, deleted, replied to, or
forwarded – again, this is crucial to BlackBerrytype devices as that is how the IMAP server can
synchronize messages between the device, the
server, and any other device simultaneously
accessing the same mailbox.
Port 161
International Standard
Simple Network Management Protocol
(SNMP port)
UDP port used to manage, configure, and gather
information about network devices (e.g. Firewalls,
Routers) in a unified and uniform manner across
a varied range of manufacturers. Most server
operating systems, whether Windows or not,
provide support for this protocol.
Note : Home and Small office devices tend to
use UPNP for this purpose.
Port 179
International Standard
Border Gateway Protocol port
The Border Gateway Protocol (BGP) is a routing
protocol used to exchange routing information
between routers in autonomous networks.
Page 4 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 379
List of Common TCP/IP Port Numbers
Type
Microsoft
Application
Site Replication Serivces (SRS port)
TCP Port used by Microsoft Site Replication
Services.
This services enables LDAP enabled servers to
replicate between each other information stored
on Microsoft Active Directory domain Controllers
and Exchange Servers.
Port 389
International Standard
Light Weight Directory Access
Protocol port (LDAP port)
TCP Port used to find and manage network
resources on an a hierarchical network systems
such as Novell Network Directory Trees (NDS),
and Microsoft Active Directory Service Domains.
Port 443
International Standard
Secure HTTP traffic port (SSL port)
This is the default port used for SSL encrypted
communications (SSL = Secure Socket Layer),
such as, for example, when you login to a secure
site to purchase something. From a System
Administrator’s viewpoint, this is the port that is
used for incoming and outgoing SSL
connections.
Port 445
International Standard
Microsoft Active Directory and SMB
Protocol port
This port is used by Microsoft Active Directory
services and Microsoft SMB (Server Message
Block) protocols.
SMB is also known as
“Microsoft Windows Network” and is the main
protocol used by Microsoft Server Operating
Systems for client/server access, and file and
printer sharing.
Port 465
Google
Google Mail Outgoing Mail Server
Google uses this non-standard port for its
Outgoing Mail Server for Google Mail. Use this
port, smtp.gmail.com, and SSL connection
(SMTP Server Authentication) when configuring
your email client for Google Mail (GMAIL).
Port 636
International Standard
LDAP over SSL
TCP Port used for Lightweight Directory Access
Protocol over Secure Socket Layer connections.
This a standard added to LDAP to prevent the
interception of information and credentials using
the LDAP protocol.
This standard is used by Microsoft Exchange
server and many other LDAP enabled server
applications.
SEE LDAP PORT : 389
Page 5 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 993
List of Common TCP/IP Port Numbers
Type
International Standard
Application
Secure Internet Message Access
Protocol port (Secure IMAP port)
TCP Port used for SSL Secured IMAP 4 access.
See IMAP4 Port: 143.
Port 995
Google
Google Mail Incoming POP3 Mail
Server (GMAIL port)
Google uses this non-standard port for its POP3
Incoming Mail Server for Google Mail (GMAIL).
Use this port, pop.gmail.com, and SSL
connection when configuring your email client.
Port 1026
Novell
Calendar Access Protocol port (CAP)
Port used by Novell GroupWise for its
Calendar Access Protocol.
Microsoft
Port 1080
De-Facto Standard
On some
Windows 2000
servers
port 1026 is used by the Windows T ask
Scheduler or other Windows services.
SOCKS / Online Chatting / Hotmail
This port is used mainly by applications such as
ICQ,
AOL Instant Messenger, for online
chatting. It is also used by Hotmail.
Port 1090
De-Facto Standard
Real Audio port
Port used by Real Audio video and audio
streaming applications.
Port 1433
Microsoft
SQL Server Port & SQL Server
Replication Port
Used by Microsoft SQL Server 6 and above for
SQL replication between SQL servers.
Port 1434
Microsoft
SQL Server Monitoring Port
Used by Microsoft SQL Server to monitor SQL
server performance.
Port 1521
Oracle
Default Oracle port
Default port for connection to an Oracle database
server.
Port 1677
Novell
Novell GroupWise
Standard port used by Novell GroupWise for
TCP/IP communications between clients and
agents and the GroupWise Post Office Agent
(POA).
Page 6 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 1701
List of Common TCP/IP Port Numbers
Type
International Standard
Application
Layer Two Tunnelling Protocol port
(L2TP port)
A tunnelling and encryption standard used to
connect two Private Business networks together
over an Internet connection to create a Virtual
Private Network (VPN).
This protocol is seen as the replacement to
PPTP (port 1723 listed below).
Port 1720
De-Facto Standard
H.323 port
Port used for video conferencing equipment
which uses the H.323 protocol.
Port 1723
International Standard
Point to Point Tunnelling Protocol port
(PPTP port)
A tunnelling and encryption standard used to
connect two Private Business networks together
over an Internet connection (creating one Virtual
Private Network). This is the default protocol for
establishing a VPN on Windows 2000 Server.
Port 1900
Microsoft
Media Center Extender – Xbox 360
port
UDP inbound. Port used by Microsoft’s Xbox
360 when linking to Media Center.
Port 2409
SPAMFighter
SPAMFighter Content Classification
port
UDP inbound and Outbound. Port used by the
SPAMFighter software to communicate with its
servers in order to determine which emails are
spam or not.
Port 3101
Research in Motion
Blackberry Enterprise Server (BES)
Synchronization Port (BES port)
If you have an outbound firewall, then you
will need to open this port (TCP) to
enable the Blackberry Enterprise Server
to synchronize with the Blackberry
devices. Additionally, depending on the
configuration of your particular site, you
may also need to port forward port 3101
from your router to the Blackberry
Enterprise Server.
Port 3306
MySQL AB
Default MySQL Port
Default port for connection to a MySQL database
server.
Page 7 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 3389
List of Common TCP/IP Port Numbers
Type
Microsoft
Application
Remote Desktop Port & Terminal
Services Port
TCP Inbound & Outbound. Default port used
by Windows XP Remote Desktop Connection
and Microsoft T erminal Server for Remote
Desktop Connections and/or T erminal Services
sessions. For added security it is recommended
to change the Remote Desktop port from its
default to a value of your choice – this can be
changed in the Registry at
HKLM\System\CurrentControlSet\Control\Ter
minal Server\WinStations\RDPTcp\PortNumber (the “RDP-T cp” part may have
a different name if you renamed your T erminal
Server \ Remote Desktop connection).
Port 3390
Microsoft
Media Center Extender – Xbox 360
port
TCP Inbound. Port used by Microsoft’s Xbox
350 when linking to Media Center.
Port 3535
GoDaddy
GoDaddy Secure SMTP Relay port
Port used by GoDaddy customers for email
sending using SMTP relay with authentication
over any ISP connection via GoDaddy’s Outgoing
Mail Server, smtpout.secureserver.net. This
enables GoDaddy customers to email from
anywhere without having to constantly change
their email settings to reflect the SMTP server
corresponding to the Internet connection they are
using at the time – instead they can email through
GoDaddy’s SMTP Relay regardless of where
they are.
Port 4321
De Facto Standard
RWHOIS port
Port used for “RWhoIs” requests.
Port 4664
Google
Google Desktop Search port
Port 5190
America On Line
AOL Instant Messenger port
Port used by AIM, the AOL Instant Messenger
software.
Port 5500
DualDesk
DualDesk port
Default port used by the DualDesk remote control
software.
Port 5631
PCAnywhere
PCAnywhere 5631 TCP incoming port
Port on which a Symantec PC Anywhere host
accepts incoming PC Anywhere connections and
then continues to communicate with the remote
PC. If you have a PC Anywhere host behind a
firewall or firewalled router, then you need to allow
(and possibly port forward) incoming TCP
connections on this port.
Page 8 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 5632
List of Common TCP/IP Port Numbers
Type
PCAnywhere
Application
PCAnywhere 5632 UDP incoming port
Port used by Symantec’s PC Anywhere for the
streaming of screen updates during a PC
Anywhere session. If you have a PC Anywhere
host behind a firewall or firewalled router, then
you need to allow (and possibly port forward)
incoming UDP connections on this port.
Port 5900
RealVNC Ltd
(De-facto VNC default
port)
Port 7070
Real Networks
RealVNC Default Remote Control Port
This is the default RealVNC port for port
forwarding to the RealVNC host. You
should always change this port from its
default as it is a well-known port for all
VNC remote control programs and it will
therefore be one of the first targets of
hackers !
Real Streaming Audio port
Port used by Real Networks’ audio streaming
servers.
Port 7100
Novell
Novell GroupWise
Standard port used by Novell GroupWise for
TCP/IP communications between the Message
Transfer Agent (MTA) and other agents.
Port 8000
Mirra Inc
Mirra Personal Server
Communications port
Port used by both the Mirra Client running on the
PC, and the Mirra Personal Server, to
communicate with each other. This is a TCP
port.
Port 8080
International Standard
HTTP Internet traffic port
The other port through which HTTP Internet
traffic also goes through.
Port 8799
Vodafone UK
GPRS Internet Access Proxy port
Port used for GPRS Internet Browsing on the
Vodafone UK mobile phone network. If you are
on Vodafone you typically need to configure your
phone to access the Internet via a proxy on port
8799.
The
proxy
address
is
:
212.183.137.12:8799.
Port 8880
De Facto Standard
CDDB port
Port used by CD mastering software to
communicate with an Internet based CDDB
server for requests about artist and track names.
Port 9100
Google
Google Web Accelerator port
Port used by Google Web Acceleration
technology. Google Web Accelerator supports
natively only Internet Explorer and FireFox at the
time of writing, 2-Sep-2006. Other browsers
need to have their HTTP Proxy configured to
127.0.0.1:9100.
Page 9 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.
AnswersThatWork
Port
Port 19430
List of Common TCP/IP Port Numbers
Type
Mirra Inc
Application
Mirra Personal Server Discovery port
This is a UDP port used by the Mirra Client
software running on the PC to discover its
assigned Mirra Personal Server (Broadcast over
UDP).
Port 39720
Lime Wire LLC
LimeWire communications port
This is the default port which the LimeWire
peer-to-peer file-sharing program uses (can be
changed by the end-user).
oooooooOOOOOOOooooooo
Page 10 of 10
© Copyright AnswersThatWork.com, 27-Sep-2008.